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Finding the Fourth Proportional to 1,153.73, 1,593.48 and 840.40

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Solution

The fourth proportional to 1,153.73, 1,593.48 and 840.40 is: 1,160.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,153.73 : 1,593.48 = 840.40 : x
  2. Step 2: Convert to fraction form
    1,153.73/1,593.48 = 840.40/x
  3. Step 3: Cross multiply
    1,153.73x = 1,593.48 × 840.40
  4. Step 4: Simplify right side
    1,153.73x = 1,339,148.42
  5. Step 5: Solve for x
    x = 1,339,148.42/1,153.73
  6. Step 6: Final answer
    x = 1,160.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.